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Re: [Qemu-devel] [PATCH] linux-user: identify running binary in /proc/se
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH] linux-user: identify running binary in /proc/self/exe |
Date: |
Fri, 30 Jan 2009 21:10:08 +0100 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Mon, Jan 26, 2009 at 09:07:11PM +0200, Riku Voipio wrote:
> Some applications like to test /proc/self/exe to find
> out who they are. Fake the result of readlink() for
> them. Use realpath() to return full path to binary
> (which the links /proc/self/exe are)
>
> updated version - fix ret/errno in the /proc/self/exe case.
>
> Signed-off-by: Riku Voipio <address@hidden>
Thanks, applied.
> ---
> linux-user/main.c | 3 +++
> linux-user/qemu.h | 1 +
> linux-user/syscall.c | 15 ++++++++++++---
> 3 files changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/linux-user/main.c b/linux-user/main.c
> index cb10173..3418ca6 100644
> --- a/linux-user/main.c
> +++ b/linux-user/main.c
> @@ -37,6 +37,8 @@
>
> #define DEBUG_LOGFILE "/tmp/qemu.log"
>
> +char *exec_path;
> +
> static const char *interp_prefix = CONFIG_QEMU_PREFIX;
> const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
>
> @@ -2354,6 +2356,7 @@ int main(int argc, char **argv, char **envp)
> if (optind >= argc)
> usage();
> filename = argv[optind];
> + exec_path = argv[optind];
>
> /* Zero out regs */
> memset(regs, 0, sizeof(struct target_pt_regs));
> diff --git a/linux-user/qemu.h b/linux-user/qemu.h
> index 9fddd05..4137567 100644
> --- a/linux-user/qemu.h
> +++ b/linux-user/qemu.h
> @@ -120,6 +120,7 @@ typedef struct TaskState {
> uint8_t stack[0];
> } __attribute__((aligned(16))) TaskState;
>
> +extern char *exec_path;
> void init_task_state(TaskState *ts);
> extern const char *qemu_uname_release;
>
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 690df14..2903bf3 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -4877,13 +4877,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
> arg1,
> #endif
> case TARGET_NR_readlink:
> {
> - void *p2;
> + void *p2, *temp;
> p = lock_user_string(arg1);
> p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
> if (!p || !p2)
> ret = -TARGET_EFAULT;
> - else
> - ret = get_errno(readlink(path(p), p2, arg3));
> + else {
> + if (strncmp((const char *)p, "/proc/self/exe", 14) == 0) {
> + char real[PATH_MAX];
> + temp = realpath(exec_path,real);
> + ret = (temp==NULL) ? get_errno(-1) : strlen(real) ;
> + snprintf((char *)p2, arg3, "%s", real);
> + }
> + else
> + ret = get_errno(readlink(path(p), p2, arg3));
> + break;
> + }
> unlock_user(p2, arg2, ret);
> unlock_user(p, arg1, 0);
> }
> --
> 1.5.6.5
>
>
>
>
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net